| Form N-CSR Cover | 12 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE SPECTRUM FUNDS II, INC. |
| Entity Central Index Key | 0000923084 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 12 Months Ended |
| May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | T. ROWE PRICE SPECTRUM FUNDS II, INC. |
| Entity Central Index Key | 0000923084 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| C000169939 | |
| Shareholder Report [Line Items] | |
| Fund Name | Spectrum Moderate Growth Allocation Fund |
| Class Name | I Class |
| Trading Symbol | (TGIPX) |
| Annual or Semi-Annual Statement [Text Block] | Annual Shareholder Report |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find the funds prospectus, financial information on Form N-CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at |
| Expenses [Text Block] | What were the fund costs for the last year? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Spectrum Moderate Growth Allocation Fund - I Class $53 0.48% |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 0.48% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? Global stock indexes were broadly positive, while fixed income markets were mixed for the 12 months ended May 31, 2024. Many central banks maintained tight monetary policy to combat inflation, and markets fluctuated amid shifting expectations for interest rate cuts as rates remained higher for longer. Nevertheless, investor sentiment was elevated by resilient corporate earnings and enthusiasm around the potential impacts from artificial intelligence. Versus the style-specific Morningstar Moderately Aggressive Target Risk Index, security selection in the underlying large-cap value strategy contributed for the trailing one-year period. The funds allocation in this space outperformed its style-specific benchmark, which added value on a relative basis. Likewise, security selection within large-cap growth equities also had a positive impact. On the negative side, security selection in international equities was a leading detractor during the period. In particular, allocations to both emerging markets equities and international developed markets equities trailed their respective benchmarks and weighed on relative performance. The fund seeks the highest total return over time consistent with a primary emphasis on capital growth and a secondary emphasis on income. It is designed to provide investors with a core multi-asset portfolio that is globally diversified across traditional and alternative asset classes, with an emphasis on the roles of broad diversification, fundamental research, tactical allocation, and risk management. |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception 3/23/2016 Spectrum Moderate Growth Allocation Fund (I Class) 19.99 % 9.08 % 9.52 % MSCI All Country World Index Net (Regulatory Benchmark) 23.56 11.68 10.81 Morningstar Moderately Aggressive Target Risk Index (Strategy Benchmark) 17.14 8.55 8.78 The preceding line graph shows the value of a hypothetical $500,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The funds performance information included in the line graph and table above is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the line graph and table may also include one or more indexes that more closely aligns to the fund's investment strategy (Strategy Benchmark(s)). Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. Market index returns do not include expenses, which are deducted from fund returns. The fund's total return figures reflect the reinvestment of dividends and capital gains, if any. Neither the funds returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. The funds past performance is not a good predictor of the funds future performance. www.troweprice.com |
| AssetsNet | $ 3,339,399,000 |
| Holdings Count | Holding | 1,787 |
| Advisory Fees Paid, Amount | $ 14,095,000 |
| InvestmentCompanyPortfolioTurnover | 42.90% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,339,399 Number of Portfolio Holdings 1,787 |
| Holdings [Text Block] | Security Allocation Common Stocks 69.9 % Equity Mutual Funds 12.7 Bond Mutual Funds 7.4 U.S. Government Agency Obligations (Excluding Mortgage-Backed) 2.2 Private Investment Companies 2.0 U.S. Government & Agency Mortgage-Backed Securities 2.0 Corporate Bonds 1.8 Asset-Backed Securities 0.5 Short-Term and Other 1.5 |
| Largest Holdings [Text Block] | Top Ten Holdings T. Rowe Price Real Assets Fund - I Class 5.4 % T. Rowe Price Institutional Emerging Markets Equity Fund 5.3 Microsoft 3.3 NVIDIA 2.8 T. Rowe Price Multi-Strategy Total Return Fund - I Class 2.1 T. Rowe Price International Bond Fund (USD Hedged) - I Class 2.0 T. Rowe Price U.S. Treasury Long-Term Index Fund - I Class 2.0 Apple 2.0 Blackstone Partners Offshore Fund 2.0 Amazon.com 1.9 |
| Material Fund Change [Text Block] | |
| C000005533 | |
| Shareholder Report [Line Items] | |
| Fund Name | Spectrum Moderate Growth Allocation Fund |
| Class Name | Investor Class |
| Trading Symbol | (TRSGX) |
| Annual or Semi-Annual Statement [Text Block] | Annual Shareholder Report |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find the funds prospectus, financial information on Form N-CSR (which includes required tax information for dividends), holdings, proxy voting information, and other information at |
| Expenses [Text Block] | What were the fund costs for the last year? Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Spectrum Moderate Growth Allocation Fund - Investor Class $68 0.62% |
| Expenses Paid, Amount | $ 68 |
| Expense Ratio, Percent | 0.62% |
| Factors Affecting Performance [Text Block] | What drove fund performance during the past 12 months? Global stock indexes were broadly positive, while fixed income markets were mixed for the 12 months ended May 31, 2024. Many central banks maintained tight monetary policy to combat inflation, and markets fluctuated amid shifting expectations for interest rate cuts as rates remained higher for longer. Nevertheless, investor sentiment was elevated by resilient corporate earnings and enthusiasm around the potential impacts from artificial intelligence. Versus the style-specific Morningstar Moderately Aggressive Target Risk Index, security selection in the underlying large-cap value strategy contributed for the trailing one-year period. The funds allocation in this space outperformed its style-specific benchmark, which added value on a relative basis. Likewise, security selection within large-cap growth equities also had a positive impact. On the negative side, security selection in international equities was a leading detractor during the period. In particular, allocations to both emerging markets equities and international developed markets equities trailed their respective benchmarks and weighed on relative performance. The fund seeks the highest total return over time consistent with a primary emphasis on capital growth and a secondary emphasis on income. It is designed to provide investors with a core multi-asset portfolio that is globally diversified across traditional and alternative asset classes, with an emphasis on the roles of broad diversification, fundamental research, tactical allocation, and risk management. |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Spectrum Moderate Growth Allocation Fund (Investor Class) 19.80 % 8.93 % 7.72 % MSCI All Country World Index Net (Regulatory Benchmark) 23.56 11.68 8.40 Morningstar Moderately Aggressive Target Risk Index (Strategy Benchmark) 17.14 8.55 6.99 The preceding line graph shows the value of a hypothetical $10,000 investment in the fund over the past 10 fiscal year periods or since inception (for funds lacking 10-year records). The funds performance information included in the line graph and table above is compared with a regulatory required index that represents an overall securities market (Regulatory Benchmark). In addition, the line graph and table may also include one or more indexes that more closely aligns to the fund's investment strategy (Strategy Benchmark(s)). Due to new SEC Rules on shareholder reporting the fund adopted a new broad-based securities market index, referred to as the Regulatory Benchmark. Market index returns do not include expenses, which are deducted from fund returns. The fund's total return figures reflect the reinvestment of dividends and capital gains, if any. Neither the funds returns nor the index returns reflect the deduction of taxes that a shareholder would pay on fund distributions or redemptions of fund shares. The funds past performance is not a good predictor of the funds future performance. www.troweprice.com |
| AssetsNet | $ 3,339,399,000 |
| Holdings Count | Holding | 1,787 |
| Advisory Fees Paid, Amount | $ 14,095,000 |
| InvestmentCompanyPortfolioTurnover | 42.90% |
| Additional Fund Statistics [Text Block] | What are some fund statistics? Fund Statistics Total Net Assets (000s) $3,339,399 Number of Portfolio Holdings 1,787 |
| Holdings [Text Block] | Security Allocation Common Stocks 69.9 % Equity Mutual Funds 12.7 Bond Mutual Funds 7.4 U.S. Government Agency Obligations (Excluding Mortgage-Backed) 2.2 Private Investment Companies 2.0 U.S. Government & Agency Mortgage-Backed Securities 2.0 Corporate Bonds 1.8 Asset-Backed Securities 0.5 Short-Term and Other 1.5 |
| Largest Holdings [Text Block] | Top Ten Holdings T. Rowe Price Real Assets Fund - I Class 5.4 % T. Rowe Price Institutional Emerging Markets Equity Fund 5.3 Microsoft 3.3 NVIDIA 2.8 T. Rowe Price Multi-Strategy Total Return Fund - I Class 2.1 T. Rowe Price International Bond Fund (USD Hedged) - I Class 2.0 T. Rowe Price U.S. Treasury Long-Term Index Fund - I Class 2.0 Apple 2.0 Blackstone Partners Offshore Fund 2.0 Amazon.com 1.9 |
| Material Fund Change [Text Block] |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 98 Months Ended | 120 Months Ended |
| May 31, 2024 | May 31, 2024 | May 31, 2024 | May 31, 2024 | |
| Without Sales Load [Member] | C000169939 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 19.99% | 9.08% | 9.52% | |
| Without Sales Load [Member] | C000005533 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 19.80% | 8.93% | 7.72% | |
| MSCI All Country World Index Net | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 23.56% | 11.68% | 10.81% | |
| MSCI All Country World Index Net | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 23.56% | 11.68% | 8.40% | |
| Morningstar Moderately Aggressive Target Risk Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 17.14% | 8.55% | 8.78% | |
| Morningstar Moderately Aggressive Target Risk Index | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 17.14% | 8.55% | 6.99% |
